One Good Turn (1930)

Singer Ruth Eton, of the singing team of Eton and Farrell, is told by her agents to get rid of her partner if she wants to advance her career. Instead, she gives him singing lessons. After a few months of training, he is good enough to be on his own and dumps Eton. When he loses his voice suddenly, he finds out who his true friends are.

Unfortunately the movie One Good Turn is not yet available on HBO Max.